AQA PiXL A-Level Physics - Waves & Quantum

2 points on a progressive wave are 1/3 of a wavelength apart. The distance between the two points is 2cm. If the speed of the wave is 10 ms^-1 what is the frequency of the wave?

• 5Hz

• 20Hz

• 167Hz

• 1500Hz

Which of the following waves cannot be polarized?

• Visible light

• Radio waves

• Ultrasonic

• Gamma

A guitar string of length 80cm vibrates with a third harmonic frequency of 305Hz. What is the wavelength of the wave?

• 244cm

• 53.3cm

• 16.2cm

• 3.80cm

What is the approximate phase difference between the waves shown?

• 2π

• 3 π/2

• π

• π/2

When comparing X rays with visible light, which statement is correct?

• X-rays travel faster in a vacuum

• X rays have a higher frequency

• Only X rays can be polarised

• X rays do not show diffraction effects

Which set of conditions would cause the interference maxima produced by a double slit experiment at a distance of 1.5m from the sources to be closest together?

• Yellow light 580nm from the sources 2mm apart

• Water waves of wavelength 20mm from sources 1m apart

• Ultrasonic wave of wavelength 1.5cm from sources 40mm apart

• Violet light of wavelength 380nm from sources 6mm apart

Which of the following describes the type of wave produced on a stretched guitar string after it has been plucked?

• Stationary, longitudinal, electromagnetic

• Stationary, transverse, mechanical

• Progressive, longitudinal, electromagnetic

• Progressive, transverse, mechanical

What are the conditions for total internal reflection of light to occur

• The light is travelling from a less optically dense medium to a more optically dense medium at an angle equal to the critical angle

• The light is travelling between media of equal optical densities at an angle greater the critical angle

• The light is travelling between media of equal optical densities at an angle equal to the critical angle

• The light is travelling from a more optically dense medium to a less optically dense medium at an angle greater than the critical angle

The density of a nylon guitar string of diameter 1.0 x 10^-3m is 1.15 x 10³ kgm^-1. What is the mass per unit length, µ of the nylon string?

• 1.15 kg m^-1

• 1.15 x 10⁶ kg m^-1

• 3.6 x 10^-3 kg m^-1

• 9.0 x 10^-4 kg m^-1

Two light wave sources with the same frequency and with a constant phase difference are said to be ….

• Polarised

• Diffracted

• Coherent

• Longitudinal